Electrical signaling



Sept. 6,1927. 1 641,608-

G. O. SQUIER ET AL I ELECTRICAL SIGNALING Filed'June 24. 1922 2 Sheets-Sheet l Patented Sept. 6, 1927.

UNITED STATES- enoneao. :SQUIER, OFYWASHINGTON, msrnror or ootuiu Bi memo. MAUBORGNE ,1 ,41,608 PAT-E ori-slice OF CHICAGO, rumors; AND Louis-comm, or ween-meson, .nrsraic'r or 430- LUMBIA.

ELECTRICAL sIGNAL tTG Application filed J4me 24, 1922; senai'ao. e'ze'ee's,

This invention relates to improvements in the art of electrical signaling, particulartyv in the matter of receiving high frequency current signals.

The object of the present inv'entionis an improvement in the method of and apparatus ior receiving high frequency signals Whether they are transmitted over lines or through space, as in the-easeof radio signals.

Another 'object of this invention is to secure gre'at'er'selec tivity and thereby reduce interference effects,

A still further-object ofthe invention is p to effect a simplification of the equipment required, and also facilitate the operation in the matter of ignal v In a pending patent application, Serial Number 389,451,- filedJuneB, 1920, by Louis Gohenand JosephO. h/lauborgne and patent application, Serial Number 56.6,ll af2, filed. June 7, I922, *by George Owen i Squier, new methodsand apparatus for the reception oat high frequency1 signals transmitted over lines or throng space were described; The presentinventi'on is based upon the inventions described in the applications rater-red tuning in any particular to above utilizing in a general way the same methods and apparatus, but'introducing new modifications which produce still further improvements in the" matter of selectivity and simplification in the equipment re quired, and also effecting greater simplificationin the operation of the receiving in struments. J 1 1 V 1 The broad principles of the invention have already been described in the patent applications referred to above, in which a resonance'wavecoil was employed and the Wave c levelopmentproduced on the wave coil was utilized to get the signal eifects desired. In this invention we also employ a resonance Wave coil,Which may be usedin connection with an antenna or a ire system, Whether telephone, telegraph,- lighting, OT' P'OW'Qh-ih detector being connected, electrically, to suitable pointson this resonance rwave coil. The method and circuit arrangements used can be better understood by reference to the accompanying diagrammatic figures which show typical embodiments of this invention, and form part of this specification.

In the accompanying -drawings* t Figure l is a diagrammatic view ofasystern for lcarrying .out our invention in which an electron tube is connected electrically to: two pointsenths wavelcoil through suitablernetalringsgr igure' 2 is similarito Figure 1 except that ne :of the rings which is .operatively assQeiated ith the resonance'wave coil, is.

Figure arrangement for carrying out our invention which: va Wave ice-i1 is used iorltun ing purposes and regeneration purposes at the same time. 7 I

1 llhe arrangement show-Ii in Figure 4- -dif-: terszfronrr Figure 3 in thatalseparate coilcoupled to the Wave coiliis' used for effecti ng regeneration. l Another embodiment of our invention is shown-in Figure din-whichthe resonance Wave coil is connected to a Wire systemwhiclranay :be telephone, telegraph, lighting, or power, for the l-punpose of picking "up the signal energy which may ube transmitted over such circuits. I "Having more particular reference: to the drawings, and-- in this connection with which like characters ;of reference will; designate corresponding parts. thereof, in Figure 1' ii, the VJ-an-tenna 1 is-[connected directly to the isa' diagrammatic View of ani resonance Waveicoil '2:;-' and 4::designa-te t-vvo metal rings which 6 slide (on- .the reso Dance- :v'vave @Qligitild are electrically insulated from'zthe wave Leo-il The positions of these two rings on :the coil: areradjustabie-and may be readily .shitfited-z to different sections of the coil; 'One of these rings, '3, .-is.'con nected to the grid ;5 of an electrontube detector preferably through a condenser '6 which is shunted. Joya grid resistance 7 the other ring, 4, .being. connected *to the filamen-t .81 of the electron tube detector ;:9 is the plate of the electron tube detector; 10 :desi-gnates a battery, and 'll indicates v suitable telephones. It may ,he noted here that While Prefer 11-0 Ilse/Ian" electron tube-detector "desired" range of wave 'lengths.'-It is merely a question of the. size of-'the'coil and the'iletig thi oflwire'ontheacoil in its f relation to the wave length of signals to be received. It appears that there is a definite relation between the length of Wire on the coil and the wave lengths for which the coil may be used. The greater the length of wire the greater the range of Wave lengths. adjusting the positions of the rings 3 and 4 the wave COll may be brought into reso nance for any particular wave length within the range of wave lengths of the partic ular. resonance wave coil. 1 The tuning inof a signal in this case isa very simple matter consistingmerely in the simultaneous movements of the two rings or keeping one ring stationary at. a predetermined position on the coil, and the adjustment effected by the movement of the other-ring. In either case the operation is very simple requiring only one adjustment, and the degree, of selectivity 7 obtained by this arrangement is far superior to theselectivity obtained by the usual receiving arrangements in which lumped inductances and lumped capacities are used as tuning elements. vIt is tobe observed a that in this arrangement the standing wave development on the'wave coil is utilized, the grid connection being adjusted to a loop of potential on the wave coil.

Figure 2 differs from Figure 1 in that one of the rings, specifically the one that is connected to the filament of the electrontube detector, is grounded at 12, and thus very useful in increasing the strength of the signals. r v v The arrangement shown in Figure 3 has the additional feature that the wave coil 2,

in addition to its function as a'tuning element, is 'also' used for the: purpose of effecting regeneration, and this is accomplished by connectingthe wave coil 2 in the plate filament circuit through the leads 13 :and 14 rong toproduce oscillationson the wave coiland thus make it possible toutilize the method." of beat reception for 7 receiving continuous waves,-telegrapl11c signals. For

"telephone reception the oscillations are of course undesirable andtherefore the degree of regeneration 1s carried only to the point I where the desired amount of amplification is obtained withoutactually setting up oscillations on the wave coil.

The embodiment of our invention shown in Figure 4 difiersfrom Figure 3 only in that. an independent coil 15 which is connected in the plate filament circuit is used to couple electrically the plate filament circuit to" the wave coil 2 for the purpose of effecting regeneration. The degree of coupling may be varied by either varying the number of turns on the coil 15 or changing its position on the wave coil 2. Y

Another embodiment of our invention is shown in Figure 5 in which the signals are transinittedover a wire circuit 18 (telephone, telegraph, lighting, or power) which takesthe placeof the antenna in the other figures. In this case the wave coil is con nected through small condensers 16, 17 to the wire circuit 18 and the tuning and detection of the signals is carried out inthe same way as in the arrangements described in the previous figures. In this case the function of'the small-condensersis merely to prevent a short circuit of-the .wire circuit, also to prevent low frequency currents from passing through the radio receiving equipment.

It is obvious that certain vmodifications may be made in the arrangementof the circuits without departing from the spirit of the invention. In the v arrangement shown in all the figures the grid of the electron tube detector is shown connected to the ring near to the antenna, while the filament is shown connected to the ring farther away from the antenna.- Good results can be also obtained by reversing the connections and readjusting the positionsof therings in tuning in any particular signal,i. e., the grid of the electron tube detector being connected, to the ring farther away from the antenna andthe filament connected to the ring nearer the antenna.

lVhat we claim is 7 p 1., In, atsystem for the reception of radio signals the combination of an antenna, a single wave coil,'and anelectron'tube detector, the grid. of said electron tube detector beingelectrostatically connected to one point on the wave coil, the filament of the electron tube detector being connected to another point onthe said wave coil, and the whole wave coil, 'b-eingco'nnected in the plate filament circuit forming part of the plate filament circuit thereby elfecting regeneration, the filament being grounded. I

2. In a system for the reception of radio signals, the combinationof an antenna, a

single wave, coil, a pair of metallic rings slidably mounted on said wave coil, an electron tube detector, the grid of said detector being electrostatically connected to a point on said wave coil'through one ofsaid slide rings, the-filament of said detector being electrostatically connected 'to another point on said wave coil through the-other ofsaid I 3. In a system for the reception of high frequency current signals the combination of an antenna, a Wave coil, and an electron tube detector, the grid of said electron tube detector being electrostatically connected to one point on the Wave coil, the filament of the electron tube detector being electrostatically connected to another point on the said Wave coil, part of the Wave coil being connected in the plate filament circuit forming part of the plate filament circuit thereby 10 efiecting regeneration.

In testimony whereof We afiix our signatures.

GEORGE O. SQUIER. JOSEPH O. MAUBORGNE. LOUIS COHEN. 

